The document discusses computer networks and their benefits. It covers topics like the OSI model layers, network devices, TCP/IP, network security, programming, and certification. It also provides information about network administration advantages and disadvantages. The document is intended to provide an overview of computer network concepts and topics for study.

1. Computer Network
Sritrusta Sukaridhoto

2. Why Computer Network ???
 Stand alone Computer ….
FOR WHAT ???
Computer Network – Sritrusta Sukaridhoto

3. Something interesting from
Computer Network ???
 Easiness
 No distance
 Mobility
 Efficient
Computer Network – Sritrusta Sukaridhoto

4. Network Administrator,…
 Advantages  Disadvantages
 Good salary  ERROR, then people
 Control other peoples want to kill YOU !!!
 Faster than others
 Relax
Computer Network – Sritrusta Sukaridhoto

5. Study…
 Basic network theory
 OSI Layer
 Network devices
 Routing
 Network security
 Programming
Computer Network – Sritrusta Sukaridhoto

6. Study…
 Network Skill
 Operating system
 Server – Client
 Router, Switch, Cabling, etc (network devices)
 Hacking not Cracking
 Certificate
 Experience
 Time can answer ???
Computer Network – Sritrusta Sukaridhoto

7. Open System Interconnection
(OSI)
 A model defines the stages or
tasks of a protocol as it
prepares to send data
 Open meaning standards
available to all.
 The model is devided into
seven distinct layers
 Each subsequent layer should
perform a well-defined function
and the layer boundaries are
designed to minimize the
information flow across the
interfaces
Computer Network – Sritrusta Sukaridhoto

8. OSI Model Layers
 Application Layer
 Provides a user interface (examples: HTTP, SMTP)
 Includes file, print, database, app. Services
 Presentation Layer
 Presents the data (example: JPEG)
 Includes encryption, compression and translation
services
 Session Layer
 Keeps different applications data separate
Computer Network – Sritrusta Sukaridhoto

9. OSI Model Layers
 Transport Layer
 Provides reliable delivery
 Performs error detection
 Includes end to end connection
 Network Layer
 Provides logical addressing
 Routing layer
Computer Network – Sritrusta Sukaridhoto

10. OSI Model Layers
 Data Link Layer
 Combines packets into bytes then into frames
 Performs error detection (not correction)
 Provides Media access addressing (point-to-
point)
 Media Access Control and Data Link Control
 Physical Layer
 Moves bits between devices
Computer Network – Sritrusta Sukaridhoto

11. Keys Layers of the OSI Model
Computer Network – Sritrusta Sukaridhoto

12. OSI Model and Protocols
Computer Network – Sritrusta Sukaridhoto

13. Network Devices
 Wire  Wireless
Computer Network – Sritrusta Sukaridhoto

14. Router, Switch, Hub, Modem, …
Computer Network – Sritrusta Sukaridhoto

15. TCP/IP
Computer Network – Sritrusta Sukaridhoto

16. TCP/IP
Computer Network – Sritrusta Sukaridhoto

17. Network Security
 Firewall
Computer Network – Sritrusta Sukaridhoto

18. Operating Systems
Computer Network – Sritrusta Sukaridhoto

19. Computer Network – Sritrusta Sukaridhoto

20. Hacking NOT cracking
Computer Network – Sritrusta Sukaridhoto

21. }
if (setsockopt(sockfd,SOL_SOCKET,SO_REUSEADDR,&yes,sizeof(int)) == -1)
{
perror("setsockopt");
Programming
exit(1);
}
my_addr.sin_family = AF_INET; // host byte order
my_addr.sin_port = htons(MYPORT); // short, network byte order
my_addr.sin_addr.s_addr = INADDR_ANY; // automatically fill with my IP
memset(&(my_addr.sin_zero), '0', 8); // zero the rest of the struct
if (bind(sockfd, (struct sockaddr *)&my_addr, sizeof(struct sockaddr))
== -1) {
/* perror("bind");
** server.c -- a stream socket server demo exit(1);
*/ }
#include <stdio.h> if (listen(sockfd, BACKLOG) == -1) {
#include <stdlib.h> perror("listen");
#include <unistd.h> exit(1);
#include <errno.h> }
#include <string.h> sa.sa_handler = sigchld_handler; // reap all dead processes
#include <sys/types.h> sigemptyset(&sa.sa_mask);
#include <sys/socket.h> sa.sa_flags = SA_RESTART;
#include <netinet/in.h> if (sigaction(SIGCHLD, &sa, NULL) == -1) {
#include <arpa/inet.h> perror("sigaction");
#include <sys/wait.h> exit(1);
#include <signal.h> }
#define MYPORT 3490 // the port users will be connecting to while(1) { // main accept() loop
#define BACKLOG 10 // how many pending connections queue will hold sin_size = sizeof(struct sockaddr_in);
void sigchld_handler(int s) if ((new_fd = accept(sockfd, (struct sockaddr *)&their_addr,
{ &sin_size)) == -1) {
while(wait(NULL) > 0); perror("accept");
} continue;
int main(void) }
{ printf("server: got connection from %sn",
int sockfd, new_fd; // listen on sock_fd, new connection on new_fd inet_ntoa(their_addr.sin_addr));
struct sockaddr_in my_addr; // my address information if (!fork()) { // this is the child process
struct sockaddr_in their_addr; // connector's address information close(sockfd); // child doesn't need the listener
int sin_size; if (send(new_fd, "Hello, world!n", 14, 0) == -1)
struct sigaction sa; perror("send");
int yes=1; close(new_fd);
if ((sockfd = socket(AF_INET, SOCK_STREAM, 0)) == -1) { exit(0);
perror("socket"); }
exit(1); close(new_fd); // parent doesn't need this
}
return 0;
}
Computer Network – Sritrusta Sukaridhoto

22. Server - Client
Computer Network – Sritrusta Sukaridhoto

23. Certificate
Computer Network – Sritrusta Sukaridhoto

24. Network topics
 IPv6
 Mobile-IP
 MPLS
 Network Security, VPN, IPSec
 Quality of Service
 VoIP
 Wireless
 Web-base application
 Encryption Decryption
 Streaming
Computer Network – Sritrusta Sukaridhoto

25. EEPIS Computer Network
 Lab Jaringan Komputer
 Ka.Lab: Sritrusta Sukaridhoto
 Gedung D4 lt. 3
 UPT Jaringan Komputer
 Ka.UPT: Dadet P
 Network Admin: Sukaridhoto, Hendri, Firman,
Reza
 Gedung IT lt. 2
Computer Network – Sritrusta Sukaridhoto

26. Thank You…
Computer Network – Sritrusta Sukaridhoto